Lighting equipment for moving-picture machines



TpF, UHLEMANNJ LIGHTING EQUiPlVlENTFOR MOVING PICTURE MACHINES. APPLICATION FILED NOV, 29. I918.

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7 "Ell? CIA/WE/VTOR $1 ATTORNEY- d WLMX/M T. F. UHLEMANN.

LIGHTIN GTQUIPMENT FOR MOVING PICTURE MACHINES.

APPLICATION FILED NOV. 29, 1918.

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@NHTEE) STATES PATENT @FFHQE.

THEOMRE E. UHLEMANN, 0E NEW YQRK, N. 2., ASSIGNOR T0 NICHOLAS POWER CQBEPANY, 0h NEW YQEK, 16. Y., A CORPORATION 018 DELAWARE.

LIGHTING EQZUTJFMENT FUR MQVING-fiICTU MACHINES.

Application filed November 29, 1918. Serial No. 264,685.

To all whom it may concern:

Be it lmown that I, Tnnononn F. UHLE- MANN, a citizen of the United States, and a resident of the city, county, and State of New York, have invented new and useful Improvements in Li hting Equipments for Moving-Picture Mac ines, of which the following is a specification.

'l l1lS lIlV8Ill;l0Il relates to lamp outfits for pro ect on apparatus and has for its object to provide an outfit utilizing an incandescent electric lamp as the source of light, the outfit being desi ed to facilitate the accurate focusing o the light with regard to its refiector and the condensers of the optical system and also to permit the ready substitution of one light for another in case the filament should burn out during the exhibition.

The invention also provides various improvements in details of construction, as will be more fully understood from the following specification taken in connection with the ac companying drawings, wherein I have illus trated a preferred practical embodiment of the invention.

In the said drawings:

Fig. l is a side elevation chiefly in outline, showing the general arrangement of the moving picture machine, the lamp house and the stereopticon lens;

Fig. 2 is a side elevation of the lamp structure with the lamp house shown in section;

Fig. 3 is a plan view of the lamp structure partly in section with reflector removed.

My improved lighting outfit constitutes in a general way an improvement over the outfit shown in the United States Patent No. 1,354,583 granted to John F. Skerrett, and in Fig. 1 I have shown a moving picture and stereopticon equipment similar to that disclosed in the said application. As here shown the outfit consists of a frame 1 which supports at its forward end the moving picture mechanism or head 2 and at its rear end is provided with longitudinal track rods 3 on which the projecting lam is mounted for adjustment toward and rom the moving picture machine. house 5 is not mounted directly on the track rods but is supported by an intermediate pair of horizontal track rods 4 upon which it is laterally adjustable to bring the light into line with either the moving picture machine or the stereopticon 'side flanges The lamp--- lenses 6 supported in the usual manner upon a bracket projecting from one side of the moving picture mechanism.

The amphouse 5 comprises a substantially square box of sheet metal having doors on each side for giving access to the lamp and provided with ventilating openings top and bottom to allow proper circulation of air through the lamphouse.

A post 11 projects upwardly from the floor ot the lamphouse near its rear wall, and swiveled on the post for rocking movement in a horizontal plane just clear of the floor is a fork or sector 12 from which are supported the sockets for the incandescent lamps, of which two are provided so that in case one burns out the other may be brought into operation by swinging the sector on the post 11.

The lamp supporting members are identical for the two lamps, so only one need be described.

The fork or sector 12 comprises two arms extending radially outward from the hub with a connecting circumferential bridge piece 13, near each end of which is a projection 14. forming a support for a slide 15 upon which the lamp is supported. Each slide comprises a front part projecting beyond the pro'ection l4: and havin spaced orming in effect a ork and providing spaced bearings for a guide rod 16 and adjustino screw 17 upon which the base plate 18 of the lamp socket is supported for lateral adjustment.

The slide 15 is mounted on the projection 14 by means of rods 19 fixed to the slide along the under side of its rear portion, between the rear flange of the front fork and a downwardl turned flange at the rear of the slide. T e rods pass through holes in the projection 14 so that the under face of the slide is maintained just out of contact with the upper face of the projection. Als o supported in the rear flange of the slide 1s an adjusting screw 2O, the screw being swiveled in the slide 15 and threaded into the projection 14, whereby the rotation of the screw will shift the slide radially to and fro on the projection.

B this arrangement the slide 15 is capabl of radial adjustment with relation to the post 11 while the base plate 18 1s mounted for lateral adjustment with relation to slide 15, whereby the lamp supported on the base plate may be given any adjustment in a horizontal plane with relation to the post 11, within the range provided by the adjusting screws 20. The lamp is also supported for vertical adjustment on the base plate 18 so that the light may be exactly positioned in all directions with re ard to the condensers and reflector 30. or this purpose the base plate 18 is provided with a vertical socket in which is mounted a post 21 having" at its upper end a lamp su porting plate 35 and just beneath the p ate a circumferential groove 46 for receiving the pins of an adjusting fork or lever 22 which 1s fulcrumed for movement in a vertical plane upon the upper face of the base plate 18 to the rear of t e lamp socket. The rear end of the lever 22 is also forked to embrace an adjusting nut 23 workin on a vertical screw 36 set in the rear end 0 the base plate 18, whereby the post may be conveniently and accurately raised and lowered in its socket. The post 21 is also free to rotate for the purpose of positioning the lamp filament with its greatest area toward the condensers, after the bulb has been screwed securely into its socket. A thumb-screw 24% is provided for locking the post in its adjusted position.

The lamp socket is supported on the head at the post 21'by means of a plate 37 of insulating material in which the socket 25 is set. The socket comprises the usual centrally insulated button for engagement with one terminal of the lamp filament, the metal of the socket constituting theother terminal and the button and socket are connected respectively to binding posts or wire connectors 26 attached to the socket plate 37 at its op osite edges, and to which the circuit CODd UlCiJOIS will be attached in. any well known manner.

Supported on the post 11 for vertical and iustment is a reflector bracket 27 having at its upper end a horizontal bearing 28 in which the threaded stem 29 of the reflector 30 is mounted to slide, but is held against rotation by a thumb screw 28 working in i. keyway 29 in the side of the screw. The bearing 28 is bifurcated to receive an ad justing nut 31 whereby the reflector will be horizontally adjusted by the rotation'of the nut and may be locked in its position of adjustment by tightening the screw 28*.

p A. stop 32 is fixed to the post 11 near its base in position to lie in a slot 32 in the hub of the sector 12, the slot being of a length such that when the iorlr. is in one extreme position permitted by the stop one lamp will be brought between the reflector and the condenser of lamp house when the for-l: is swung to extreme 'osition in the other dire on, the other amp will be brought to opei position.

,r i. use,

A condenser 33 may be fixedly mounted in the front wall oi? the lamp house or it desired, in a swin 'ng bracket 34 to facilitate the use of tlie lamp for projecting lantern slides.

The operation of the apparatus will be obvious from the above description. Before the exhibition both lamps are carefully adjusted to the proper positions with regard to the reflector and condenser by means of the several adjusting screws so that in the event that one lamp fails during the exhibi tion the fork or sector has merely to be swung on its post to its other extreme position of adjustment as determined b the stop 32 to bring the other lamp into immediate operation, its center of illumination being in a position substantially identical with that previously occupied b the center of illumination of the other amp. The sector may turn a little stifiy on its bearings so as to retain any position to which it is adjusted. The lamps will of course have separate switches or, if desired, instead of having separate circuits for the lamps, contact brushes may be substituted for the binding post 26 positioned to come into engagement with contact plates fixedin the lamphouse and thereby light Whichever lamp is in operative" position, substantially in the manner disclosed in the co-pending application above. mentioned.

It is to be understood that the structure may be otherwise modified in its several details without departing from the spirit of the invention or the scope ofthe appended claims.

I claim:

1. In an apparatus of the class described comprising a lamp house, the combination of a support associated therewith and mounted for limited movement, the total em tent of said movement being small relative to the dimensions of the lamp house, a plu rality of lamps supported thereby and independently adjustable with relation thereto, whereby said lamps may be spaced apart a distance such that the shifting of the support through its limited movement brings the center of illumination of one lamp into the exact position previously occupied by that of the other lamp.

2; In an apparatus of the class described, the combination of a support mounted for oscillation in a horizontal plane thpough an arc of limited amplitude, a plurality of lamps mounted on said support, means for independently mounting the lamps on said support so that theymay be spaced apart a distance equal exactly to the arc of movement of said support, and a condenser for concentrating the rays of said lamps on the picture to be projected, said lamps being positioned on their support so that one of said lamps will be positioned at the locus Mid of said condenser in each extreme position of adjustment of said lamp support.

3, In an apparatus of the class described, the combination of a lamp-supporting bracket mounted for oscillation through a limited arc in a horizontal plane, a vertical pin on which said bracket is mounted, a plurality of lamp-supporting slides carried I by said bracket and adjustable radially toward and away from said pin, a second slide carried by each of said first mentioned slides, means for adjusting said second slides transversely of the first mentioned slides, a lamp socket carried by each of said second slides, and a reflector supported on said pivoted pin in position to cooperate with one of said lamps When said bracket is in one extreme position of adjustment and with the other said lamp when said bracket is adjusted to its other extreme position.

4. In an apparatus of the class described, the combination of a lamp supporting bracket mounted for oscillation through a limited arc in a horizontal plane, a vertical pin on which said bracket is mounted, a plurality of lamp-supporting slides carried by said bracket and adjustable radially toward and away from said pin, a second slide carried by each of said first mentioned slides, means for adjusting said second slides transversely of the first mentioned slides, a lamp socket carried by each of said second slides, means for vertlcally adjusting said lamp sockets, a reflector supported on said-pivot pin in position to cooperate with one of said amps when said bracket is in one extreme position of adjustment and w ith the other said lamp when said bracket is adjusted to its other extreme position, and means for adjusting said reflector vertically and horizontally.

5. In a lighting apparatus for projecting machines, the combination of a lamp-house,

a condenser supported in one wall thereof for concentrating the rays of light on the picture to be projected, a fixed supporting post in said lamp-house, a lamp-supporting bracket mounted on said post for pivotal movement, two lamps independently supported on said bracket, means for inde pendently adjusting said lamps radially, transversely, and vertically of said bracket whereby each lamp may be adjusted to position its filament in the focus of the condenser in one extreme position of movement of said bracket, and a reflector supported on said pivot post for adjustment toward and away from said condenser.

6. In an apparatus of the class described, the combination of a reflector and a condenser having a common focus, a support mounted for oscillation in a horizontal plane through an arc of limited amplitude, a plurality of lamps mounted on said support,

of New York and State of New York, this 14 day of ()ctober, 1918.

THEODORE F. UHLEMANN. 

